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NOT
TOO COLD
NOT
TOO HOT
NOT
TOO WET
There is more
at stake in starting a job in fair weather than the comfort of the
painter. Paint performs better in mild conditions, in fact poor
painting conditions can greatly compromise the paint job.
NOT
TOO COLD
Most paints
should not be applied when the air temperature or the surface being
painted is below 10 degrees C. Painting in cold weather is more difficult,
and it takes longer to dry, leaving the wet paint more susceptible
to dirt, insects and pollen.
If you use
an acrylic paint, wait until the temperature is predicted to remain
above the recommended minimum for the next 24 hours! Keeping above
this minimum temperature while the paint dries will ensure that the
acrylic paint forms its optimum film strength.
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NOT
TOO HOT
If you paint
when it’s too hot, the paint may be more difficult to apply
and may not last as long. This is
especially true with acrylic paints. For best results, avoid painting in the following
conditions, especially if more than one condition exists: air or
surface temperature exceeds 30 degrees C; direct sunshine (particularly
dark coloured paint); gusty winds; low humidity; highly porous surfaces
such as old, weathered masonry. These conditions can make the
paint dry too quickly, so that spreading is more difficult, and may
also inhibit formation of a paint film of optimum strength and
adhesion.
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NOT
TOO WET
When
painting with solvent based paints, allow damp surfaces to dry fully
before painting.
Waterbased paints however, are more forgiving of damp
surfaces. Any surface water should be removed, but waterbased paints
can be applied if the surface is still damp.
But
what about painting in rainy weather ?
Naturally it is not a good idea to be painting while rain is
actually falling because it could result in the fresh, undried paint
being rinsed off the wall.
An old ‘rule of thumb?which generally works well, is ?
if you wouldn’t hang out your washing, don’t paint?
But
perhaps more important is that even if it is not currently raining,
to ensure that you don’t paint when it is likely that the fresh
paint could be affected by rain or heavy dew during its first few
hours of drying.
This means it is not
wise to paint late in the day if the weather is likely to be
cold and damp overnight.
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